8Mud
NAXJA Forum User
- Location
- Central Germany
The starter relay supplies current to the fuel pump circuit (downstream of the ballast resistor) while cranking. The fuel pump relay supplies current (upstream of the ballast resistor) after the engine is running (and during cranking).
The fuel pump relay also supplies power to the injector drivers in the ECU.
I doubt replacing the relay is going to solve your problem, unless I misunderstood your issue.
IMO either the fuel pump relay is opening for whatever reason when you have to key in the run position, but is working in the start position. Or you have a wiring, splice (or connector) problem between the fuel pump relay and the fuel pump circuit.
It's possible the relay or a connection someplace is so bad, it doesn't pass enough current for the injectors, the fuel pump and a few other functions all at one time, unlikely but possible.
My best guess would be an open circuit between the fuel pump relay and the fuel pump circuit. Which is usually the ballast resistor, but can be any number of splices, connectors or a broken wire someplace.
Maybe I'm just not getting it?
The fuel pump relay also supplies power to the injector drivers in the ECU.
I doubt replacing the relay is going to solve your problem, unless I misunderstood your issue.
IMO either the fuel pump relay is opening for whatever reason when you have to key in the run position, but is working in the start position. Or you have a wiring, splice (or connector) problem between the fuel pump relay and the fuel pump circuit.
It's possible the relay or a connection someplace is so bad, it doesn't pass enough current for the injectors, the fuel pump and a few other functions all at one time, unlikely but possible.
My best guess would be an open circuit between the fuel pump relay and the fuel pump circuit. Which is usually the ballast resistor, but can be any number of splices, connectors or a broken wire someplace.
Maybe I'm just not getting it?